Function of the CVS

Question 1

Functions of the CVS

Answer 1

• transports O2/CO2 + nutrients, metabolites and hormeones
• Thermoregulation

Flexible
-vessels can redirect/store blood

Question 2

Which organs receieve the least blood supply during excercise?

Answer 2

• gut and kidneys receive a smaller proportion of CO during excercise
• this occurs through vasoconstriction ( sympathetic activity)

Question 3

State the properties of muscular arteries and give an example

Answer 3

-

-wide lumen, non-elastic wall

Question 4

State the properties of arterioles

Answer 4

• AKA resistance vessels
• narrow lumen ( small radius), high resistance and thick contractile wall
• controls resistance , hence BF + allows regional redirection of blood

Question 5

State the properties of capillaries

Answer 5

• AKA exchange vessels

- narrow lumen, thin wall ( BIG SA-VOL ratio)

Question 6

State properties of veins and venules

Answer 6

• wide lumen, distensible wall, storage of blood due to large lumen
• low resistance , allows fractional distribution of blood between veins